Vermont Casting DVRT39 Twist-lockPipes, How to Use the Vent Graph, Rear Wall Vent Application

Vermont Castings, Majestic Products DVRT36/39/43

Twist-lock Pipes

When using Vermont Castings, Majestic Products twist-lock pipe it is not necessary to use sealant on the joints. The only areas of the venting system that need to be sealed with high temperature silicone sealant are the collars on the fireplace and the sliding joint of any telescopic vent section used in the system.

To join twist-lock pipes together, simply align the beads of the male end with the grooves of the female end, twisting the pipe until the flange on the female end contacts external flange on the male end. It is recommended that you secure the joints with three (3) sheet metal screws; however, this is not mandatory with twist-lock pipe. (Fig. 17)

To make it easier to assemble the joints we suggest putting a lubricant (Vaseline or similar) on the male end of the twist-lock pipe prior to assembly.

	Male End	Female End
	Screw Holes
		TWL100
Fig. 17	Twist-lock pipe joints.

How to Use the Vent Graph

The Vent Graph should be read in conjunction with the following vent installation instructions to determine the relationship between the vertical and horizontal dimensions of the vent system.

1.Determine the height of the center of the horizontal vent pipe exiting through the outer wall. Using this dimension on the Sidewall Vent Graph below, locate the point intersecting with the slanted graph line.

2.From the point of this intersection, draw a vertical line to the bottom of the graph.

3.Select the indicated dimension, and position the fireplace in accordance with same.

Example A:

If the vertical dimension from the floor of the fire- place is 11’ (3.4m), the horizontal run to the face of the outer wall must not exceed 14’ (4.3m).

Example B:

If the vertical dimension from the floor of the unit is 7’ (2.14m), the horizontal run to the face of the outer wall must not exceed 8¹⁄₂’ (2.6m).

30
29
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27
26									theto	Vertical
25
24
23									centerhorizontalventpipetheof	dimensionfromfloorunitthetheof
22
21
20
19
18
17
16
15
14
13
12								eg: A
11
10
9
8
7
							eg: B
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5
4
3
3	4	5	6	7	8	9	10 11 12 13 14 15 16 17 18 19		20

Horizontal dimension from the outside face of the wall to the center of the fireplace vent flange

Sidewall Vent Graph showing the relationship between vertical and horizontal dimensions for a Direct Vent flue system.

CFM102

Fig. 18 Sidewall Vent Graph (dimensions in ft.).

Rear Wall Vent Application

When installed as a rear vent unit this appliance may be vented directly to a termination located on the rear wall behind the appliance.

•Only Vermont Castings, Majestic Products venting components are approved to be used in these applications. See ‘Venting Components’ listed for different installation requirements.

•The maximum horizontal distance between the rear of the appliance (or end of the transition elbow in a corner application) and the outside face of the rear wall is 20” (508 mm). (Fig. 19)

•Only one 45° elbow is allowed in these installations.

•The minimum clearances between any combustible

material and the vent pipe sections are:

Top	2” (51mm)
Sides	1” (25mm)
Bottom	1” (25mm)

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